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# 检索型问答（Retrieval QA）

![LangChain](https://pica.zhimg.com/50/v2-56e8bbb52aa271012541c1fe1ceb11a2_r.gif 'LangChain中文网')


这个示例展示了在索引上进行问答的过程。

import Example from "@snippets/modules/chains/popular/vector_db_qa.mdx"

<Example/>

import ExampleWithSources from "@snippets/modules/chains/popular/vector_db_qa_with_sources.mdx"

<ExampleWithSources/>
